Transmission and Rear Axle Oils - 1934 Hudson

Old Fogey UK

I'm about to do a complete change of the oils in the transmission and rear axle of my '34 H8.

I know that I have to use yellow metal friendly oils but I don't know if I need to use classic EP (Extreme Pressure) or classic non-EP - which is it ?

I don't use the car when the temperature is less than 40F, so can I use summer spec SAE oils all year round ?

Advice would be greatly appreciated, please !

David.

tigermoth

EP additives with certain sulphurs are very bad for yellow metals. GL-4 oils are yellow metal safe

I do not change transmission or differential oils with seasonal temp changes.

regards, Tom

Old Fogey UK

Thank you, Tom.

You can get yellow metal safe EP oil here in the UK so I just wanted to check whether I needed it, but it seems I don't.

Is GL-1 oil OK as well ?

tigermoth

GL-1 is compatible with gearboxes that contain yellow metals

regards, Tom

Old Fogey UK

Thank you again, Tom.

I'm guessing I'll be safe using this one for the transmission and the axle ?

80w90 Gear Oil Mineral GL-4 Yellow Metal Safe – Westway Oils

Best wishes,

David.

tigermoth

Yes

regards, Tom

Old Fogey UK

Thanks again, Tom.

I've ordered a 5L can.

D.